φ

φ englanniksi

1. The ratio, an irrational number with a value of approximately 1.618033988 which expresses the relationship that the sum of two quantities is to the larger quantity as the larger is to the smaller.

2. Euler's totient function, an arithmetic function that counts totatives

3. Lower-case phi ((l)), the 21st letter of the ancient alphabet. It represented the voiceless aspirated bilabial plosive|bilabial plosive (IPAchar) and later the (w) (IPAchar). It is preceded by υ and followed by χ.

4. The case letter phi (φι), the 21st letter of the modern alphabet|Greek alphabet.